8.2.1 Participants
Forty-nine adult listeners with sensorineural hearing loss participated in this study. They were divided into six groups according the degree and configuration of their hearing loss. The following is a list of criteria for inclusion in each group.
1. Very high frequency hearing loss: the three-frequency pure tone average (PTA) is less than 41 dB HL with thresholds at 2000 Hz less than 40 dB HL.
2. Moderate flat hearing loss: PTA is greater than 41 dB HL with threshold at 2000 Hz less than 55 dB HL.
3. Moderately-severe, gently sloping hearing loss: PTA is greater than 41 dB HL with threshold at 2000 Hz between 55 and 60 dB HL).
4. Moderate to severe flat hearing loss: PTA is greater than 41 dB HL with thresholds at 2000 Hz between 61 and 70 dB HL.
5. Moderate to severe sloping hearing loss: PTA is greater than 41 dB HL with thresholds at 2000 Hz greater than 70 dB HL.
6. Precipitous, high- frequency hearing loss: PTA is less than 41 d B HL with thresholds at 2000 Hz greater than 40 dB HL.
Figures 14 through 19 are group audiograms showing averaged thresholds (both ears) for each of the participants with hearing loss. All but three listeners who participated in the study had symmetrical hearing losses. In addition, data were collected for ten listeners without hearing loss.
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